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/******************************************************************************

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 *

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 *  $Id$

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 *

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 *  Copyright (C) 2006  Florian Pose, Ingenieurgemeinschaft IgH

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 *

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 *  This file is part of the IgH EtherCAT Master.

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 *

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 *  The IgH EtherCAT Master is free software; you can redistribute it

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 *  and/or modify it under the terms of the GNU General Public License

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 *  as published by the Free Software Foundation; either version 2 of the

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 *  License, or (at your option) any later version.

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 *

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 *  The IgH EtherCAT Master is distributed in the hope that it will be

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 *  useful, but WITHOUT ANY WARRANTY; without even the implied warranty of

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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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 *  GNU General Public License for more details.

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 *

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 *  You should have received a copy of the GNU General Public License

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 *  along with the IgH EtherCAT Master; if not, write to the Free Software

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 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

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 *

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 *  The right to use EtherCAT Technology is granted and comes free of

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 *  charge under condition of compatibility of product made by

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 *  Licensee. People intending to distribute/sell products based on the

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 *  code, have to sign an agreement to guarantee that products using

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 *  software based on IgH EtherCAT master stay compatible with the actual

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 *  EtherCAT specification (which are released themselves as an open

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 *  standard) as the (only) precondition to have the right to use EtherCAT

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 *  Technology, IP and trade marks.

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 *

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 *****************************************************************************/

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/**

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   \file

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   EtherCAT device ID.

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*/

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/*****************************************************************************/

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#include <linux/list.h>

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#include <linux/netdevice.h>

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#include "globals.h"

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#include "device_id.h"

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/*****************************************************************************/

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static int ec_device_id_parse_mac(ec_device_id_t *dev_id,

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        const char *src, const char **remainder)

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{

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    unsigned int i, value;

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    char *rem;

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    for (i = 0; i < ETH_ALEN; i++) {

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        value = simple_strtoul(src, &rem, 16);

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        if (rem != src + 2

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                || value > 0xFF

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                || (i < ETH_ALEN - 1 && *rem != ':')) {

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            return -1;

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        }

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        dev_id->octets[i] = value;

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        if (i < ETH_ALEN - 1)

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            src = rem + 1;

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    }

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    dev_id->type = ec_device_id_mac;

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    *remainder = rem;

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    return 0;

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}

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/*****************************************************************************/

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void ec_device_id_clear_list(struct list_head *ids)

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{

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    ec_device_id_t *dev_id, *next_dev_id;

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    list_for_each_entry_safe(dev_id, next_dev_id, ids, list) {

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        list_del(&dev_id->list);

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        kfree(dev_id);

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    }

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}

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/*****************************************************************************/

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static int ec_device_id_create_list(struct list_head *ids, const char *src)

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{

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    const char *rem;

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    ec_device_id_t *dev_id;

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    unsigned int index = 0;

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    while (*src) {

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        // allocate new device ID

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        if (!(dev_id = kmalloc(sizeof(ec_device_id_t), GFP_KERNEL))) {

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            EC_ERR("Out of memory!\n");

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            goto out_free;

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        }

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        if (*src == ';') { // empty device ID

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            dev_id->type = ec_device_id_empty;

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        }

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        else if (*src == 'M') {

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            src++;

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            if (ec_device_id_parse_mac(dev_id, src, &rem)) {

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                EC_ERR("Device ID %u: Invalid MAC syntax!\n", index);

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                kfree(dev_id);

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                goto out_free;

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            }

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            src = rem;

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        }

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        else {

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            EC_ERR("Device ID %u: Unknown format \'%c\'!\n", index, *src);

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            kfree(dev_id);

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            goto out_free;

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        }

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        list_add_tail(&dev_id->list, ids); 

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        if (*src) {

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            if (*src != ';') {

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                EC_ERR("Invalid delimiter '%c' after device ID %i!\n",

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                        *src, index);

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                goto out_free;

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            }

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            src++; // skip delimiter

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        }

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        index++;

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    }

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    return 0;

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out_free:

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    ec_device_id_clear_list(ids);

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    return -1;

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}

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/*****************************************************************************/

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int ec_device_id_process_params(const char *main, const char *backup,

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        struct list_head *main_ids, struct list_head *backup_ids)

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{

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    ec_device_id_t *id;

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    unsigned int main_count = 0, backup_count = 0;

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    if (ec_device_id_create_list(main_ids, main))

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        return -1;

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    if (ec_device_id_create_list(backup_ids, backup))

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        return -1;

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    // count main device IDs and check for empty ones

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    list_for_each_entry(id, main_ids, list) {

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        if (id->type == ec_device_id_empty) {

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            EC_ERR("Main device IDs may not be empty!\n");

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            return -1;

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        }

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        main_count++;

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    }

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    // count backup device IDs

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    list_for_each_entry(id, backup_ids, list) {

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        backup_count++;

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    }

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    // fill up backup device IDs

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    while (backup_count < main_count) {

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        if (!(id = kmalloc(sizeof(ec_device_id_t), GFP_KERNEL))) {

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            EC_ERR("Out of memory!\n");

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            return -1;

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        }

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        id->type = ec_device_id_empty;

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        list_add_tail(&id->list, backup_ids);

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        backup_count++;

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    }

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    return 0;

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}

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/*****************************************************************************/

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int ec_device_id_check(const ec_device_id_t *dev_id,

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        const struct net_device *dev, const char *driver_name,

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        unsigned int device_index)

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{

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    unsigned int i;

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    switch (dev_id->type) {

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        case ec_device_id_mac:

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            for (i = 0; i < ETH_ALEN; i++)

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                if (dev->dev_addr[i] != dev_id->octets[i])

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                    return 0;

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            return 1;

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        default:

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            return 0;

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    }

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}

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/*****************************************************************************/